\documentclass{standalone}
\usepackage{tikz}
\usepackage{ctex,siunitx}
\usepackage{tkz-euclide}
\usepackage{amsmath}
\usetikzlibrary{patterns, calc}
\usetikzlibrary {decorations.pathmorphing, decorations.pathreplacing, decorations.shapes,}
\begin{document}
\small
\begin{tikzpicture}[>=latex,scale=1.4]
  \draw(0,0)--(3.3,0);
  \begin{scope}[rotate=30]
    \draw(0,0)--(3.6,0);
    \draw[very thick](1.25,0.1)--(1.4,0)--(2.9,0);
    \tkzDefPoints{2/0.65/C,1.4/0.65/F1,2.6/0.65/f}
    \tkzDefShiftPoint[C](240:1.2){G}
    \tkzDefPointBy[translation = from F1 to G](C)\tkzGetPoint{F2}
    \tkzDefPointOnLine[pos=2.0](F2,C)\tkzGetPoint{N}
    \draw[->,semithick](C)--(G)node[below]{$G$};
    \draw[->,semithick](C)--(F1)node[left]{$F_1$};
    \draw[->,semithick](C)--(f)node[right]{$f$};
    \draw[->,semithick](C)--(F2)node[right]{$F_2$};
    \draw[->,semithick](C)--(N)node[left]{$N$};
    \draw[thin, densely dashed](F1)--(G)--(F2);
    \draw(2.27,0.45)--(2.96,0.18)--(2.95,0.14)(2.222,0.637)..controls(2.240,0.596)and(2.252,0.557)..(2.250,0.517);
    \draw(2.035,0.696)..controls(2.137,0.679)and(2.151,0.652)..
    (2.184,0.539)..controls(2.185,0.462)and(2.219,0.412)..
    (2.269,0.454)..controls(2.320,0.499)and(2.227,0.533)..(2.184,0.539)
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(1.903, 0.607)..controls(2.002, 0.569)and(2.071, 0.525)..
(2.127, 0.504)..controls(1.889, 0.435)and(1.876, 0.367)..
(1.946, 0.297)..controls(2.092, 0.145)and(2.193, 0.047)..
(2.006, 0.012)..controls(1.994, 0.009)and(1.974,-0.008)..
(2.169, 0.004)..controls(2.270, 0.005)and(2.260, 0.052)..
(2.188, 0.128)..controls(2.126, 0.193)and(2.133, 0.300)..
(2.052, 0.322)..controls(2.299, 0.374)and(2.469, 0.477)..
(2.222, 0.637)..controls(2.214, 0.660)and(2.218, 0.703)..
(2.199, 0.744)..controls(2.123, 0.768)and(2.046, 0.797)..
(1.974, 0.796)..controls(1.899, 0.794)and(1.882, 0.808)..
(1.884, 0.874)..controls(1.886, 0.953)and(1.801, 1.002)..
(1.731, 0.889)..controls(1.702, 0.838)and(1.746, 0.716)..(1.843, 0.743);
  \end{scope}
  \draw[thin] (0.5,0)arc(0:30:0.5)node[midway,right]{$\theta$};
\end{tikzpicture}
\end{document}